On the 7th of July 2017, 122 countries voted in favour of the Treaty on the Prohibition of Nuclear Weapons. Countries that don’t have nuclear weapons but live under their threat voted for a ban. Without the knowledge of most of their citizens, the governments of the world’s nuclear powers didn’t vote, and yet the ban went ahead. Something new is happening. On September 1st, 1939, Nazi Germany and Slovakia invade Poland, beginning the European phase of World War II.